[go-nuts] remove last index of character from string and also want use strings.LastIndex(s, sep string)

[long . asyn]

var str = "a/b/c/d/c"
// I want remove last chracter from str
var strRunes = []rune(str)
var newStrRunes = strRunes[0 : len(strRunes)-1]
// then I want get last index of chracters `/c`, I need convert 
to string back!???
strings.LastIndex(string(newStrRunes), "/c")
// Does there have a method that LastIndex(rs []rune, s string)

Thanks for your help!

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Re: [go-nuts] remove last index of character from string and also want use strings.LastIndex(s, sep string)

[long . asyn]

Thanks for your reply. the `str[0:len(str)-1]` not work for NO ascii 
chracters.

https://play.golang.org/p/7i6-3Zcy36



On Friday, May 26, 2017 at 11:06:10 PM UTC+8, messju mohr wrote:
>
> Hi, 
>
> On Fri, May 26, 2017 at 07:10:43AM -0700, long...@gmail.com  
> wrote: 
> >var str = "a/b/c/d/c" 
> >// I want remove last chracter from str 
> >var strRunes = []rune(str) 
> >var newStrRunes = strRunes[0 : len(strRunes)-1] 
> >// then I want get last index of chracters `/c`, I need 
> convert to string back!??? 
> >strings.LastIndex(string(newStrRunes), "/c") 
> >// Does there have a method that LastIndex(rs []rune, s 
> string) 
> >Thanks for your help! 
>
> You don't have to convert to a slice of runes: 
>
> var str = "a/b/c/d/c" 
> var newStr = str[0:len(str)-1] 
> fmt.Println(strings.LastIndex(newStr, "/c")) 
>
> Or you have to convert your slice back to a string: 
>
> var str = "a/b/c/d/c" 
> var strRunes = []rune(str) 
> var newStrRunes = strRunes[0 : len(strRunes)-1] 
> fmt.Println(strings.LastIndex(string(newStrRunes), "/c")) 
>
> HTH 
> messju 
>

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[go-nuts] Re: remove last index of character from string and also want use strings.LastIndex(s, sep string)

[long . asyn]

I find the method like:

package main


import (
 "fmt"
 "strings"
 "unicode/utf8"
)


func main() {
 var str = "a/b/汉字/d/汉字"
 var _, size = utf8.DecodeLastRuneInString(str)
 // Does `str[0:len(str)-size]` have memory copy? 
 var i = strings.LastIndex(str[0:len(str)-size], "/汉字")
 fmt.Println(i)
}



But I don't know if str[0:len(str)-size] if copy the string? If the code 
will copy the string, I will covert the string to []byte first. Because I 
need several times check for the str.
Where I can find some article about that(str copy)?


On Friday, May 26, 2017 at 10:45:09 PM UTC+8, long...@gmail.com wrote:
>
> var str = "a/b/c/d/c"
> // I want remove last chracter from str
> var strRunes = []rune(str)
> var newStrRunes = strRunes[0 : len(strRunes)-1]
> // then I want get last index of chracters `/c`, I need 
> convert to string back!???
> strings.LastIndex(string(newStrRunes), "/c")
> // Does there have a method that LastIndex(rs []rune, s 
> string)
>
> Thanks for your help!
>

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